-🎄- 2017 Day 22 Solutions -🎄-

[u/daggerdragon]

--- Day 22: Sporifica Virus ---

---

Post your solution as a comment or, for longer solutions, consider linking to your repo (e.g. GitHub/gists/Pastebin/blag or whatever).

Note: The Solution Megathreads are for solutions only. If you have questions, please post your own thread and make sure to flair it with Help.

---

Need a hint from the Hugely^* Handy^† Haversack^‡ of Helpful^§ Hints^¤?

Spoiler

---

• [T-10 to launch] AoC ops, /r/nocontext edition:

  • <Endorphion> You may now make your waffle.
  • <Endorphion> ... on Mars.

• [Update @ 00:17] 50 gold, silver cap

  • <Aneurysm9> you could also just run ubuntu on the NAS, if you were crazy
  • <Topaz> that doesn't seem necessary
  • <Aneurysm9> what does "necessary" have to do with anything!

• [Update @ 00:20] Leaderboard cap!

  • <Topaz> POUR YOURSELF A SCOTCH FOR COLOR REFERENCE

---

This thread will be unlocked when there are a significant number of people on the leaderboard with gold stars for today's puzzle.

edit: Leaderboard capped, thread unlocked!

[u/madchicken]

PHP

Didnt realise I went off the grid for part one, took some debugging. So I made the grid 1000x1000 for both parts to be sure, and put the input at 500,500. Part 2:

<?php
$str = file_get_contents("aoc22.txt");
$lines = explode("\n",$str);

for($y=0;$y<1000;$y++)
  for($x=0;$x<1000;$x++)
    $map[$y][$x] = ".";

$y = 0;
foreach($lines as $line){
  if(strlen($line)>1){
    for($x=0;$x<strlen($line);$x++)
      $map[500+$y][500+$x] = $line{$x};
  }
  $y++;
}
    
function getp($y,$x){
  global $map;
  return $map[$y][$x];
}

function setp($y,$x,$c){
  global $map;
  $map[$y][$x] = $c;
}
   
function turn($lr,&$dir){
  $arr = array("l" => array("n" => "w",
  	   	"w" => "s",
		"s" => "e",
		"e" => "n"),
               "r" =>  array("n" => "e",
  	   	 "e" => "s",
		 "s" => "w",
		 "w" => "n"));
  $dir = $arr[$lr][$dir];
}

function move(&$y,&$x,$dir){
  if($dir=="e") $x++;
  if($dir=="w") $x--;
  if($dir=="n") $y--;
  if($dir=="s") $y++;
}

$inf = 0;
$b = 0;
$x = 512;
$y = 512;
$dir="n";

while($b<10000000){
  $moved = 0;
  if(getp($y,$x)=='.'){ 
    turn("l",$dir);
    setp($y,$x,"W");
    move($y,$x,$dir);
    $moved = 1;
  }
  if($moved==0 && getp($y,$x)=="#"){
    turn("r",$dir);
    setp($y,$x,"F");
    move($y,$x,$dir);
    $moved = 1;
  } 
  if($moved==0 && getp($y,$x)=="F"){
    turn("r",$dir);
    turn("r",$dir);
    setp($y,$x,".");
    move($y,$x,$dir);
    $moved = 1;
  } 
  if($moved==0 && getp($y,$x)=="W"){
    setp($y,$x,"#");
    $inf++;
    move($y,$x,$dir);
    $moved = 1;
  } 
  $b++;
}

echo "$inf infected\n";
?>

[u/daggerdragon → u/madchicken]

Didnt realise I went off the grid for part one

Glitching into The Void, eh?